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POjni undefined symbol error
 

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  1. POjni undefined symbol error
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    <p>I'm trying JNI sample code.<br> (You can get all below sources through github: <a href="https://github.com/pilhoon/jni-test" rel="nofollow">https://github.com/pilhoon/jni-test</a> )</p> <ul> <li>Sample.java</li> </ul> <pre> public class Sample { public native int intMethod(int n); public native boolean booleanMethod(boolean bool); public native String stringMethod(String text); public native int intArrayMethod(int[] intArray); public static void main(String[] args) { System.loadLibrary("sample"); Sample sample = new Sample(); int square = sample.intMethod(5); boolean bool = sample.booleanMethod(true); String text = sample.stringMethod("JAVA"); int sum = sample.intArrayMethod(new int[]{1,1,2,3,5,8,13} ); System.out.println("intMethod: " + square); System.out.println("booleanMethod: " + bool); System.out.println("stringMethod: " + text); System.out.println("intArrayMethod: " + sum); } } </pre> <ul> <li>sample.c</li> </ul> <pre> #include "sample.h" #include &lt;string.h&gt; #ifdef __cplusplus extern "C" { #endif JNIEXPORT jint JNICALL Java_Sample_intMethod (JNIEnv *env, jobject obj, jint num) { return num * num; } JNIEXPORT jboolean JNICALL Java_Sample_booleanMethod (JNIEnv *env, jobject obj, jboolean boolean) { return !boolean; } JNIEXPORT jstring JNICALL Java_Sample_stringMethod (JNIEnv *env, jobject obj, jstring string) { const char *str = (*env)->GetStringUTFChars(env, string, 0); char cap[128]; strcpy(cap, str); (*env)->ReleaseStringUTFChars(env, string, str); return (*env)->NewStringUTF(env, strupr(cap)); } JNIEXPORT jint JNICALL Java_Sample_intArrayMethod (JNIEnv *env, jobject obj, jintArray array) { int i, sum = 0; jsize len = (*env)->GetArrayLength(env, array); jint *body = (*env)->GetIntArrayElements(env, array, 0); for (i=0; iReleaseIntArrayElements(env, array, body, 0); return sum; } void main(){} #ifdef __cplusplus } #endif </pre> <ul> <li>sample.h</li> </ul> <pre> /* DO NOT EDIT THIS FILE - it is machine generated */ #include &lt;jni.h&gt; /* Header for class Sample */ #ifndef _Included_Sample #define _Included_Sample #ifdef __cplusplus extern "C" { #endif /* * Class: Sample * Method: intMethod * Signature: (I)I */ JNIEXPORT jint JNICALL Java_Sample_intMethod (JNIEnv *, jobject, jint); /* * Class: Sample * Method: booleanMethod * Signature: (Z)Z */ JNIEXPORT jboolean JNICALL Java_Sample_booleanMethod (JNIEnv *, jobject, jboolean); /* * Class: Sample * Method: stringMethod * Signature: (Ljava/lang/String;)Ljava/lang/String; */ JNIEXPORT jstring JNICALL Java_Sample_stringMethod (JNIEnv *, jobject, jstring); /* * Class: Sample * Method: intArrayMethod * Signature: ([I)I */ JNIEXPORT jint JNICALL Java_Sample_intArrayMethod (JNIEnv *, jobject, jintArray); #ifdef __cplusplus } #endif #endif </pre> <p>And I compiled these with gcc on CentOS 6.3</p> <pre> prompt$ gcc -c -o sample.o -fPIC sample.c -I /usr/java/jdk1.7.0_07/include/ -I /usr/java/jdk1.7.0_07/include/linux/ prompt$ gcc -shared -o libsample.so sample.o </pre> <p>But when I run 'java Sample', an error occurs.</p> <pre> java: symbol lookup error: /home/ph/tmp/jni/libsample.so: undefined symbol: strupr </pre> <p>How can I fix this?</p>
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    1. COOK, if this issue is because of an non-standard function, why does this run well without jni? I think jni only gives interface so if I can run some code on native-C or C++, It must be possible with jni. Doesn't it?
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